Number (add/sub)

Hong Kong

Stage 1

Lesson

Adding 3 numbers at a time might look tricky, but you can use the same strategies used for adding 2 numbers to help you.

Have a look at the video below. Watch how the strategies of using a number line and compensation were applied.

One strategy was not mentioned - bridge to 10. You can also apply bridge to 10 with 3 numbers. What do you think that might look like?

Evaluate $41+7+1$41+7+1

Evaluate $3+42+4$3+42+4

A bakery sells $105$105 cakes, $60$60 bread rolls and $50$50 muffins in the morning.

What is the total number of items the bakery sells in the morning?

$155$155

A$110$110

B$215$215

C$205$205

D